NEC VERSA 2760MT

This device is in the WorkNeeded:OriginalParts category because it was flagged as missing information on the original parts. It may have replacement parts listed but those cannot be assumed to be identical to the originals. If you have a list of the original parts, please feel free to add them by copying the relevant table from EditorsToolbox:Tables

This device is in the WorkNeeded:ReplacementParts category because it was flagged as missing information on replacement parts. If it has the original parts listed you may be able to search for replacements using the parametric searches available from parts distributors. If you have or make a list of replacement parts, please feel free to add them by copying the relevant table from EditorsToolbox:Tables

NEC VERSA 2760MT

Preliminary Information
Release Year	1997
Leak Risk	High
Batteries	Yes, NiMH for CMOS + RTC and Li-Ion for main battery
Mounting Technology	Through Hole, SMD, QFP, BGA, ZIF Sockets, FFCs, High Density Interconnects
Capacitor Types	Aluminum Electrolytic, Tantalum, Ceramic, Polymer
Destructive Entry	Yes, brittle plastics, sealed external PSU brick

The NEC VERSA 2760MT is a PC laptop from 1997 with a 166 MHz Intel Pentium MMX CPU and NeoMagic MagicGraph 128XD GPU.

Known Issues

Unit does not turn on but battery charges or frequently encounters errors during boot sequence

CMOS NiMH battery has died

• The rechargeable NiMH CMOS battery has a finite cycle life and will fail
• If infrequently used the NiMH CMOS battery will leak

• 

  First boot error

• 

  Second boot error

• 

  Damage to Motherboard

Solutions

• Remove or replace NiMH CMOS battery
• Repair any corrosion damage from leaks
  • The computer will still boot without a CMOS battery however date/time and any configuration will not be retained
  • SW50 can be removed and the computer will still boot, I have no clue what it does

• 

  Motherboard after corroded components removed

• 

  IO Board after corroded components removed

Unit lags heavily or freezes or turns off suddenly when running demanding applications

Thermal interface material between CPU and heatsink is bad

• The thermal paste will eventually dry out
• The thermal paste will eventually be 'pumped-out'
• This leads to poor thermal performance and overheating

Solutions

• Check rear fan is functional
• Clean dust from heatsink & fan
• Replace thermal paste on both top heat spreader, bottom heat spreader and CPU board package heat spreader.

• 

  Replaced thermal paste

Unit does not turn on or charge, PSU LED does not illuminate

Mains charger PSU has failed

• Unknown failure mode

• 

  Label on the mains power adapter

Solutions

• Attempt to repair original charger (difficult, glued/ultrasonically welded case)
• Buy new charger with correct specifications (19 V 2.4 A DC) with NEC charger adapter (or splice existing charge cable)

Disassembly Notes

See disassembly tab for step-by-step guide.

• The plastic in this device is thin and extremely brittle, the design relies on the rigidity of the PCBs to support the weight of the device, you are very likely to break plastic pieces when attempting a repair.
• While this device uses machine screws and threaded metal inserts molded into the plastic case the plastic will shear easily.
• There are a number of thin flat-flex cables and locking/hinged FFC ZIFs in this device, they are difficult to manipulate and prone to damage.
• There are a number of high density interconnects in this device, they must be disconnected and connected by applying even force without twisting the connectors to avoid damage.
• Use ESD safe equipment

Recommended Tools

Fastener Drivers

Fastener Types	Sizes	Notes
Phillips	#0	Recessed screws require thin driver shaft
Hex Nut	5 mm	For rear IO ports

Other Hand Tools

Tool	Notes
Tweezers	Removing FFC cables, retrieving screw and general manipulation
Plastic Pry Tool	To open FFC ZIFs and push in LCD connectors
Fastener Organizer	There's a lot of similar screws but with different lengths, head shapes and threads

Original Parts

Motherboard

RT6 R6MB VER=0.5A

• 

  RT6 R6MB (Version 0.5A) PCB

• 

  RT6 R6MB (Version 0.5A) PCB Top Side

• 

  RT6 R6MB (Version 0.5A) PCB Bottom Side

IO Board

RT6 R6IO VER=0.4D

• 

  RT6 R6IO (Version 0.4D) PCB

• 

  RT6 R6IO (Version 0.4D) PCB Top Side

• 

  RT6 R6IO (Version 0.4D) PCB Bottom Side

CPU Board

RT6 R6CPU VER=0.3

Replacement Parts

Repairs conducted removed CN8, CN65 and SW50, so no replacement parts were sourced. However those appear to be Molex MicoBlade connectors and an unknown possibly wide SSOP style DIP double switch.